Process for dyeing keratinous fibres employing an indole dye and at least one para-phenylenediamine containing a secondary amino group absent an oxidant other than air

ABSTRACT

Dyeing composition for keratinous fibres, especially for human keratinous fibres, characterized in that it contains, in an aqueous medium suitable for dyeing the following composition: 
     a) an indole dye; and 
     b) a para-phenylenediamine monosubstituted on one of the amino groups, corresponding to the formula: ##STR1## in which: R 12  denotes a hydrogen atom or a lower alkyl group; 
     R 13  denotes a hydrogen atom, a lower alkyl group, a lower alkoxy group or a halogen atom; and 
     R 14  denotes a hydrogen atom, a lower alkyl group, a lower alkoxy group or a halogen atom; R 14  occupying any one of the remaining positions of the benzene ring; as well as the addition salts with an acid, this composition not containing an oxidizing agent other than air.

The present invention relates to new compositions for dyeing keratinousfibers, and more especially human keratinous fibers such as the hair,containing an indole dye combined with at least onepara-phenylenediamine containing a secondary amino group, as well as theprocess for using these compositions.

The colour of the hair, skin and hairs of human origin originates mainlyfrom melanin pigments secreted by melanocytes. These pigments of naturalorigin comprise, in particular, pigments referred to as eumelanins.

Their natural biosynthesis takes place in several steps throughpolymerization of the oxidation products of an amino acid, namelytyrosine, and one of its oxidation products is 5,6-dihydroxyindole whichpolymerizes, in turn, to eumelanin.

It has already been proposed in the past to dye human hair with5,6-dihydroxyindole or indole dyes which make it possible to carry outprogressive dyeing of the hair, that is to say to obtain a colorationexhibiting light hues after one application of the product up to darkhues by the superposition of different applications.

Dyeing takes place slowly, however, and to accelerate the formation ofthe melanin pigment in order to obtain dark hues more rapidly, differentprocesses have already been described, in particular, in French Patents1,133,594 and 1,166,172, employing two steps and oxidizing-agents suchas hydrogen peroxide or catalytic oxidizing agents of a metallic nature.

Other oxidizing agents such as iodide ions, metal anions, nitrites,periodates and rare metal salts have also been recommended.

The Applicant has just discovered, and this forms the subject of theinvention, that by using an aqueous solution containing an indole dyeand at least one paraphenylenediamine monosubstituted on one of theamino groups, or its addition salts, it was possible to obtain veryrapidly a progressive dyeing of the hair in natural hues ranging fromblond to black.

He found, in addition, that, with the compositions according to theinvention, the hair was dyed more rapidly in dark tints compared withthe conventional process utilizing only 5,6-dihydroxyindole by way of adye.

The compositions according to the invention permit a progressive dyeingof human hair in the ambient air and without the use of an oxidizingagent.

The subject of the invention is hence dyeing compositions for keratinousfibers, especially for human keratinous fibers such as human hair,containing, by way of a dye, at least one indole dye and at least oneparaphenylenediamine monosubstituted on one of the amino groups.

Another subject of the invention consists of the dyeing processemploying such a composition.

Other subjects of the invention will become apparent on reading thedescription and the examples which follow.

The dyeing composition according to the invention is essentiallycharacterized in that it contains, in an aqueous medium suitable fordyeing, an indole dye and at least one para-phenylenediaminemonosubstituted on one of the amino groups, or its addition salts withan acid.

The indole dye preferably corresponds to the formula: ##STR2## in which:R₁ represents a hydrogen atom, a lower alkyl group or a group --SiR₆ R₇R₈ ;

R₂ and R₃, which may be identical or different, represent a hydrogenatom or alternatively a lower alkyl group, a carboxyl group, a (loweralkoxy)carbonyl group or a group --COOSiR₆ R₇ R₈ ;

R₄ and R₅, which may be identical or different, represent a hydrogenatom, a linear or branched C₁ -C₂₀ alkyl group, a formyl group, a linearor branched C₁ -C₂₀ acyl group, a linear or branched C₃ -C₂₀ alkenoylgroup, a group --SiR₆ R₇ R₈, a group --P(O)(OR₉)₂ or a group SO₂ OR₉, oralternatively R₄ and R₅, together with the oxygen atoms to which theyare attached, form a ring optionally containing a carbonyl group, amethylene group, a thiocarbonyl group or a group: ##STR3## R₉ and R₁₀represent a hydrogen atom or a lower alkyl group, R₁₁ representing alower alkoxy group or a mono- or dialkylamino group, R₆, R₇ and R₈,which may be identical or different, representing linear or branchedlower alkyl groups;

and the addition salts with inorganic or organic acids as well as thecorresponding alkali metal, alkaline earth metal or amine salts.

Lower alkyl or alkoxy radicals preferably denote C₁ -C₆ radicals.

Among preferred compounds of formula (I),5,6-dihydroxyindole,2-methyl-5,6-dihydroxyindole,5-methoxy-6-hydroxyindole,(5 or 6)-acetoxy-(6 or 5)-hydroxyindole, 2-carboxy-5,6-dihydroxyindole,3-methyl-5,6-dihydroxyindole, 2,3-dimethyl-5,6-dihydroxyindole and theirsalts may be mentioned more especially.

5,6-Dihydroxyindole is especially preferred, and it is used as it is orin one of its protected forms such as, for example, the diacetate.

The para-phenylenediamines monosubstituted on one of the amino groups,usable according to the invention, correspond to the formula: ##STR4##in which: R₁₂ denotes a hydrogen atom or a lower alkyl group;

R₁₃ denotes a hydrogen atom or alternatively a lower alkyl or loweralkoxy group or a halogen atom; and

R₁₄ denotes a hydrogen atom, a lower alkyl or lower alkoxy group or ahalogen atom; R₁₄ occupying any one of the remaining positions of thebenzene ring.

Lower alkyl or alkoxy radicals preferably denote C₁ -C₄ radicals.

Especially preferred salts of these compounds are the hydrochlorides,hydrobromides, sulphates or tartrates.

Preferred para-phenylenediamines monosubstituted on one of the aminogroups, corresponding to the formula (II), are selected from compoundscorresponding to the formula (II) in which R₁₂ denotes hydrogen ormethyl and R₁₃ and/or R₁₄ denote(s) hydrogen, methyl, methoxy or achlorine atom.

Among these compounds, those which are especially preferred are selectedfrom N-(β-methoxyethyl)-paraphenylenediamine,N-(β-methoxyethyl)-2-methoxy-paraphenylenediamine,N-(β-hydroxyethyl)-2-methoxy-paraphenylenediamine,N-(β-hydroxyethyl)-para-phenylenediamine,N-(β-methoxyethyl)-2-chloro-para-phenylenediamine,N-(β-hydroxyethyl)-2-chloro-para-phenylenediamine,N-(β-hydroxyethyl)-2-methyl-para-phenylenediamine and their salts suchas the hydrochlorides, dihydrochlorides or sulphates.

The indole dye is preferably used in the composition according to theinvention in proportions of between 0.1 and 5% by weight, and moreespecially between 0.2 and 2% by weight, relative to the total weight ofthe composition.

The para-phenylenediamines monosubstituted on one of the amino groupsare preferably used in the compositions according to the invention inproportions of between 0.05 and 1% by weight, and especially between 0.1and 0.5% by weight, relative to the total weight of the composition.

The compositions according to the invention contain, in a preferredembodiment, other dyes, and in particular so-called "rapid" oxidationdyes, that is to say dye precursors having a benzene-based structure,capable of generating the coloured compound by simple oxidation in theair during the exposure time on the hair, generally less than 1 hour,and in the absence of any other oxidizing agent such as iodide ions.

The "rapid" oxidation dyes are more especially selected fromtrihydroxylated derivatives of benzene such as 1,2,4-trihydroxybenzeneand 2,4,5-trihydroxytoluene or their protected forms such as thetriacetate.

According to the invention, the rapid oxidation dyes are used inproportions of between 0.02 and 1%, and preferably between 0.05 and0.3%, by weight relative to the total weight of the composition.

An especially preferred embodiment of the invention consists of acomposition containing, in a cosmetically acceptable medium suitable fordyeing, the indole dye, and more especially 5,6-dihydroxyindole, apara-phenylenediamine monosubstituted on one of the amino groups, andmore especially the preferred para-phenylenediamines mentioned above orone of their salts, and 1,2,4-trihydroxybenzene or its triacetate, insufficient proportions for dyeing hair, and preferably those proportionsmentioned above.

The aqueous medium suitable for dyeing has a pH which can vary between 4and 11, and preferably between 6 and 9. It is adjusted to the desiredvalue by means of alkalinizing or acidifying agents known per se, inparticular those used in cosmetics when the compositions are intendedfor use for the dyeing of human hair.

The aqueous medium can contain, in addition, solvents which must becosmetically acceptable when the compositions are used for the dyeing ofhuman hair.

These solvents are used in proportions which can range up to 30%relative to the total weight of the composition, and are selected, moreespecially, from lower alcohols such as ethyl alcohol, propyl orisopropyl alcohol, tert-butyl alcohol; glycols such as ethylene glycol,propylene glycol; glycol ethers such as ethylene glycol monomethyl,monoethyl and monobutyl ethers, ethylene glycol monoethyl ether acetate,propylene glycol and dipropylene glycol monomethyl ethers; and methyllactate.

Preferred solvents consist of ethyl alcohol, propylene glycol andethylene glycol monobutyl ether.

These compositions can assume the form of a lotion, thickened orotherwise, a gel or an aerosol mousse, and can contain adjuvants wellknown in hair dyeing for this type of application, such as plasticizingagents, antioxidant agents, thickening agents, conditioning agents suchas cationic polymers, cationic surfactants; they can also containanionic, nonionic or amphoteric surfactants, as well as silicones, inparticular volatile silicones.

The thickening agents are selected, more especially, from sodiumalginate, gum arabic, guar or carob gum, heterobiopolysaccharides suchas xanthan gum, cellulose derivatives such as methylcellulose,hydroxyethylcellulose, hydroxymethylcellulose, hydroxypropylcelluloseand carboxymethylcellulose and various polymers having thickeningfunctions, such as acrylic acid derivatives.

Inorganic thickening agents such as bentonite may also be used. Thesethickening agents are preferably present in proportions of between 0.1and 5% by weight, and especially between 0.5 and 3% by weight, relativeto the total weight of the composition.

The compositions according to the invention preferably containantioxidant agents in sufficient proportions to avoid a prematureoxidation of the dyes, and which are preferably between 0.03 and 1% byweight. They are selected, in particular, from sulphites, hydrosulphitesand ascorbic acid.

An embodiment of the invention can also consist in storing thecomponents of the composition in separate compartments, optionallyprotected from the air, and in carrying out the mixing of the differentconstituents at the time of use.

The process for dyeing keratinous fibers, and especially human hair,consists in applying on the fibers at least one composition as definedabove for sufficient time to develop in the air a coloration of thekeratinous fibers, and especially human hair. This dyeing takes placewithout the addition of an oxidation catalyst or an oxidizing agentother than the air.

According to a preferred embodiment, the composition is applied severaltimes successively, and it is found that the tint obtained becomesincreasingly dark, this also being referred to as progressive dyeing.

The application of the composition is followed after an exposure periodof 5 to 50 minutes by a rinse, optional shampooing, a further rinse anddrying.

The examples which follow are intended as an illustration of theinvention, no limitation of the latter being, however, implied.

EXAMPLE 1

The following composition is prepared:

    ______________________________________                                        5,6-Dihydroxyindole    0.21     g                                             N-(β-Methoxyethyl)-para-                                                                        0.33     g                                             phenylenediamine dihydrochloride                                              Xanthan gum sold by the company                                                                      2.0      g                                             Rhone Poulenc under the name                                                  RHODOPOL SC                                                                   Glycoside alkyl ether sold at a                                                                      3.5      g AS                                          concentration of 60% AS by the                                                company SEPPIC under the name                                                 TRITON CG 110                                                                 Triethanolamine        4.0      g                                             Tartaric acid          0.3      g                                             Ethyl alcohol          10.0     g                                             Preservatives          qs                                                     Water                  qs 100.0 g                                             ______________________________________                                    

An application of this composition is carried out on natural grey hairwhich is 90% white.

The composition is left in place for 10 minutes. The hair is rinsed anddried. Hair dyed in a dark blond hue is obtained, whereas an applicationcarried out under the same conditions with the composition containingonly 5,6-dihydroxyindole leads to a golden blond, or that containingonly N-(β-methoxyethyl)-para-phenylenediamine dihydrochloride does notdye.

After three applications for 10 minutes each, rinsing and drying betweeneach application, a matt, very dark chestnut brown hue is obtained withthe said composition, while with the same composition containing only5,6-dihydroxyindole an ashen chestnut brown is obtained, andN-(β-methoxyethyl)-para-phenylenediamine dihydrochloride does not dye.

EXAMPLE 2

The following composition is prepared:

    ______________________________________                                        5,6-Dihydroxyindole    0.21     g                                             N-(β-Methoxyethyl)-para-                                                                        0.33     g                                             phenylenediamine dihydrochloride                                              1,2,4-Trihydroxybenzene                                                                              0.18     g                                             Xanthan gum sold by the company                                                                      2.0      g                                             RHONE POULENC under the name                                                  RHODOPOL SC                                                                   Glycoside alkyl ether sold at a                                                                      3.5      g AS                                          concentration of 60% AS by the                                                company SEPPIC under the name                                                 TRITON CG 110                                                                 Triethanolamine        4.0      g                                             Tartaric acid          0.3      g                                             Ethyl alcohol          10.0     g                                             Preservatives          qs                                                     Water                  qs 100.0 g                                             ______________________________________                                    

Three applications of this composition are carried out on natural greyhair which is 90% white. Each application corresponds to an exposuretime of 10 minutes followed by a rinse and drying. A very dark chestnutbrown hue with warm glints is obtained at the end.

EXAMPLE 3

The following composition is prepared:

    ______________________________________                                        5,6-Dihydroxyindole    0.21     g                                             N-(β-Methoxyethyl)-2-methoxy-p-                                                                 0.41     g                                             phenylenediamine sulphate                                                     Xanthan gum sold by the company                                                                      2.0      g                                             RHONE POULENC under the name                                                  RHODOPOL SC                                                                   Glycoside alkyl ether sold at a                                                                      3.5      g AS                                          concentration of 60% AS by the                                                company SEPPIC under the name                                                 TRITON CG 110                                                                 Triethanolamine        4.0      g                                             Tartaric acid          0.3      g                                             Ethyl alcohol          10.0     g                                             Preservatives          qs                                                     Water                  qs 100.0 g                                             ______________________________________                                    

Three applications of this composition are performed on natural greyhair which is 90% white, for 10 minutes each, each being followed by arinse and drying. An ashen medium grey hue is obtained at the end, while5,6-dihydroxyindole alone in the same vehicle leads to an ashen chestnutbrown and N-(β-methoxyethyl)-2-methoxy-p-phenylenediamine sulphate alonegives a light blond with a drab hue.

EXAMPLE 4

Example 3 is reproduced by adding 0.18 g of 1,2,4-trihydroxybenzene tothe composition. After three applications, a luminous medium grey isobtained.

EXAMPLE 5

The following composition is prepared:

    ______________________________________                                        5,6-Dihydroxyindole    0.21     g                                             N-(β-Hydroxy-ethyl)-2-methoxy-                                                                  0.39     g                                             p-phenylenediamine sulphate                                                   Xanthan gum sold by the company                                                                      2.0      g                                             RHONE POULENC under the name                                                  RHODOPOl SC                                                                   Glycoside alkyl ether sold at a                                                                      3.5      g AS                                          concentration of 60% AS by the                                                company SEPPIC under the name                                                 TRITON CG 110                                                                 Triethanolamine        4.0      g                                             Tartaric acid          0.3      g                                             Ethyl alcohol          10.0     g                                             Preservatives          qs                                                     Water                  qs 100.0 g                                             ______________________________________                                    

Three applications of this composition are performed on natural greyhair which is 90% white. Each application corresponds to an exposuretime of 10 minutes followed by a rinse and drying. At the end, the hueis ashen dark grey, while 5,6-dihydroxyindole alone in the same vehiclegives an ashen chestnut brown andN-(β-hydroxyethyl)-2-methoxy-p-phenylenediamine sulphate leads to anirridescent light blond.

EXAMPLE 6

The following composition is prepared:

    ______________________________________                                        5,6-Dihydroxyindole     0.21     g                                            N-(β-Hydroxyethyl)-2-methyl-                                                                     0.37     g                                            para-phenylenediamine sulphate                                                Xanthan gum sold by the company                                                                       2.0      g                                            RHONE POULENC under the name                                                  RHODOPOL SC                                                                   Glycoside alkyl ether sold by the                                                                     3.5      g AS                                         company SEPPIC at a concentration of                                          60% AS under the name TRITON CG 110                                           Triethanolamine         4.0      g                                            Tartaric acid           0.3      g                                            Ethyl alcohol           10.0     g                                            Preservatives           qs                                                    Water                   qs 100.0 g                                            ______________________________________                                    

Three applications of this composition are performed on natural greyhair which is 90% white. Each application corresponds to an exposuretime of 10 minutes followed by a rinse and drying. At the end, the hueis ashen dark grey, while 5,6-dihydroxyindole alone in the same vehiclegives an ashen chestnut brown andN-(β-hydroxyethyl)-2-methyl-p-phenylenediamine sulphate gives a veryslightly golden light blond.

EXAMPLE 7

The following composition is prepared:

    ______________________________________                                        5,6-Dihydroxyindole    0.21     g                                             N-(β-Hydroxyethyl)-p-phenylene-                                                                 0.35     g                                             diamine sulphate                                                              Xanthan gum sold by the company                                                                      2.0      g                                             RHONE POULENC under the name                                                  RHODOPOL SC                                                                   Glycoside alkyl ether sold at a                                                                      3.5      g AS                                          concentration of 60% AS by the                                                company SEPPIC under the name                                                 TRITON CG 110                                                                 Triethanolamine        4.0      g                                             Tartaric acid          0.3      g                                             Ethyl alcohol          10.0     g                                             Preservatives          qs                                                     Water                  qs 100.0 g                                             ______________________________________                                    

Three applications of this composition are performed on natural greyhair which is 90% white. Each application corresponds to an exposuretime of 10 minutes followed by a rinse and drying. At the end, the hueis very dark chestnut brown with deep glints, while 5,6-dihydroxyindolealone in the same vehicle gives an ashen chestnut brown andN-(β-hydroxyethyl)-p-phenylenediamine sulphate gives a golden lightblond.

EXAMPLE 8

The following composition is prepared:

    ______________________________________                                        5,6-Dihydroxyindole    0.21     g                                             N-(β-Methoxyethyl)-2-chloro-p-                                                                  0.33     g                                             phenylenediamine hydrochloride                                                Xanthan gum sold by the company                                                                      2.0      g                                             RHONE POULENC under the name                                                  RHODOPOL SC                                                                   Glycoside alkyl ether sold at a                                                                      3.5      g AS                                          concentration of 60% AS by the                                                company SEPPIC under the name                                                 TRITON CG 110                                                                 Triethanolamine        4.0      g                                             Tartaric acid          0.3      g                                             Ethyl alcohol          10.0     g                                             Preservatives          qs                                                     Water                  qs 100.0 g                                             ______________________________________                                    

After three applications of this composition for 10 minutes each,followed by a rinse and then drying in each instance, a deep purplechestnut brown hue is obtained on permanent-waved grey hair which is 90%white, while 5,6-dihydroxyindole alone gives ashen chestnut brown underthe same conditions and N-(β-methoxyethyl)-2-chloro-p-phenylenediaminehydrochloride alone gives no coloration.

EXAMPLE 9

Example 8 is reproduced, adding 0.18 g of 1,2,4-trihydroxybenzene to thecomposition. After three applications, a luminous deep purple chestnutbrown hue is obtained.

EXAMPLE 10

The following composition is prepared:

    ______________________________________                                        5,6-Dihydroxyindole    0.21     g                                             N-(β-Hydroxyethyl)-2-chloro-p-                                                                  0.26     g                                             phenylenediamine                                                              1,2,4-Trihydroxybenzene                                                                              0.18     g                                             Xanthan gum sold by the company                                                                      2.0      g                                             RHONE POULENC under the name                                                  RHODOPOL SC                                                                   Glycoside alkyl ether sold at a                                                                      3.5      g AS                                          concentration of 60% AS by the                                                company SEPPIC under the name                                                 TRITON CG 110                                                                 Triethanolamine        4.0      g                                             Tartaric acid          0.3      g                                             Ethyl alcohol          10.0     g                                             Preservatives          qs                                                     Water                  qs 100.0 g                                             ______________________________________                                    

Three applications of this composition are carried out on natural greyhair which is 90% white. Each application corresponds to an exposuretime of 10 minutes followed by a rinse and drying. A deep purplechestnut brown hue is obtained at the end, while the combination of5,6-dihydroxindole and 1,2,4-trihydroxybenzene in the same vehicle givesan ashen dark blond and N-(β-hydroxyethyl)-2-chloro-p-phenylenediaminealone does not dye.

EXAMPLE 11

The following composition is prepared:

    ______________________________________                                        2-Methyl-5,6-dihydroxyindole                                                                         0.34     g                                             monohydrobromide                                                              N-(β-Hydroxyethyl)-2-methyl-para-                                                               0.37     g                                             phenylenediamine sulphate                                                     Ethyl alcohol          10.0     g                                             Xanthan gum sold by the company                                                                      2.0      g                                             RHONE POULENC under the name                                                  RHODOPOL SC                                                                   Glycoside alkyl ether sold by the                                                                    2.1      g AS                                          company SEPPIC under the name                                                 TRITON CG 110                                                                 Tartaric acid          0.3      g                                             Triethanolamine        4.0      g                                             Preservatives          qs                                                     Demineralized water    qs 100.0 g                                             ______________________________________                                    

This gel is applied for 10 minutes on permanent-waved grey hair which is90% white. The hair is rinsed and dried. After three applications, apearlescent light chestnut brown hue is obtained on permanent-wavedhair. Under the same conditions, the indole derivative gives only anashen dark blond coloration. The para-phenylenediamine derivative, forits part, dyes in a very slightly golden light blond hue.

EXAMPLE 12

The following composition is prepared:

    ______________________________________                                        5-Methoxy-6-hydroxyindole                                                                            0.23     g                                             N-(β-Hydroxyethyl)-2-chloro-para-                                                               0.26     g                                             phenylenediamine                                                              1,2,4-Trihydroxybenzene                                                                              0.18     g                                             Ethyl alcohol          10.0     g                                             Xanthan gum sold by the company                                                                      2.0      g                                             RHONE POULENC under the name                                                  RHODOPOL SC                                                                   Glycoside alkyl ether sold by                                                                        2.1      g AS                                          the company SEPPIC under the name                                             TRITON CG 110                                                                 Tartaric acid          0.3      g                                             Triethanolamine        4.0      g                                             Preservatives          qs                                                     Demineralized water    qs 100.0 g                                             ______________________________________                                    

This gel is applied for 10 minutes on permanent-waved grey hair which is90% white. The hair is rinsed and dried. After three applications, apearlescent golden dark blond hue is obtained. Under these conditions,the indole derivative and the para-phenylenediamine derivative hardlydye the hair. The trihydroxybenzene, for its part, dyes in a pearlescentbeige light blond hue.

EXAMPLE 13

The following composition is prepared:

    ______________________________________                                        2-Carboxy-5,6-dihydroxyindole                                                                          0.5      g                                           N-(β-Hydroxyethyl)-p-phenylene-                                                                   0.8      g                                           diamine sulphate                                                              Ethyl alcohol            10.0     g                                           Sodium lauryl ether sulphate in                                               aqueous solution containing 28% of AS                                                                  0.2      g AS                                        Hydroxyethylcellulose sold by the                                                                      1.0      g                                           company AQUALON under the name                                                NATROSOL 250 HHR                                                              Glycoside alkyl ether sold containing                                                                  5.0      g AS                                        60% of AS by the company ROHM & HAAS                                          under the name TRITON CG 110                                                  Triethanolamine          qs       pH 8                                        Demineralized water      qs 100.0 g                                           ______________________________________                                    

An application of this composition is carried out on natural grey hairwhich is 90% white.

The composition is left in place for 10 minutes. The hair is rinsed anddried. Hair dyed in an irridescent golden ashen hue is obtained, whereasan application carried out under the same conditions with thecomposition containing only 2-carboxy-5,6-dihydroxyindole does not dye,or that containing only N-(β-hydroxyethyl)-p-phenylenediamine sulphateleads to a golden hue.

After three applications for 10 minutes each, rinsing and drying betweeneach application, an intense irridescent ashen hue is obtained with thesaid composition, while with the same composition containing onlyN-(β-hydroxethyl)-p-phenylenediamine sulphate a golden hue is obtained,and 2-carboxy-5,6-dihydroxyindole does not dye.

EXAMPLE 14

The following composition is prepared:

    ______________________________________                                        3-Methyl-5,6-dihydroxyindole                                                                           0.8      g                                           N-(β-hydroxyethyl)-2-chloro-para-                                                                 1.0      g                                           phenylenediamine sulphate                                                     Ethyl alcohol            10.0     g                                           Sodium lauryl ether sulphate in                                                                        0.2      g AS                                        aqueous solution containing 28% of AS                                         Hydroxyethyl cellulose sold by the                                                                     1.0      g                                           company AQUALON under the name                                                NATROSOL 250 HHR                                                              Glycoside alkyl ether sold containing                                                                  5.0      g AS                                        60% of AS by the company ROHM & HAAS                                          under the name TRITON CG 110                                                  Triethanolamine          qs       pH 6                                        Demineralized water      qs 100.0 g                                           ______________________________________                                    

Three applications of this composition are carried out onpermanent-waved grey hair which is 90% white. Each applicationcorresponds to an exposure time of 10 minutes followed by a rinse anddrying. A deep matt ashen hue is obtained at the end.

EXAMPLE 15

The following composition is prepared:

    ______________________________________                                        2,3-Dimethyl-5,6-dihydroxyindole                                                                       1.5      g                                           N-(β-Methoxyethyl)-p-phenylene-                                                                   0.1      g                                           diamine sulphate                                                              Ethyl alcohol            10.0     g                                           Sodium lauryl ether sulphate in                                                                        0.2      g AS                                        aqueous solution containing 28% of AS                                         Hydroxyethylcellulose sold by the                                                                      1.0      g                                           company AQUALON under the name                                                NATROSOL 250 HHR                                                              Glycoside alkyl ether sold containing                                                                  5.0      g AS                                        60% of AS by the company ROHM & HAAS                                          under the name TRITON CG 110                                                  Triethanolamine          qs       pH 7                                        Demineralized water      qs 100.0 g                                           ______________________________________                                    

Three applications of this composition are carried out an natural greyhair which is 90% white. Each application corresponds to an exposuretime of 10 minutes followed by a rinse and drying. An irridescent ashendark blond hue is obtained at the end.

PREPARATION EXAMPLE 1 ##STR5## 1) Preparation of4-(β-methoxyethyl)amino-3-chloronitrobenzene

0.3 mol (56.2 g) of 3,4-dichloronitrobenzene in 170 ml of2-methoxyethylamine is heated to reflux for 3 hours.

The expected product is precipitated by dilution in 500 ml of ice-coldwater. After being reconverted to a paste in water and then dried, theproduct obtained is recrystallized from acetone. It melts at 133° C.

Analysis of the product obtained gives the following results:

Analysis for C₉ H₁₁ ClN₂ O₃

    ______________________________________                                                  C    H           N      Cl                                          ______________________________________                                        Calculated  46.86  4.81        12.15                                                                              15.37                                     Found       46.81  4.99        12.17                                                                              15.17                                     ______________________________________                                    

2) Preparation of N-(β-methoxyethyl)-2-chloro-paraphenylenediaminehemisulphate hemihydrate

10.6 g of 4-(β-methoxyethyl)amino-3-chloronitrobenzene are addedportionwise to a suspension, brought to reflux, of 23 g of powdered zincin 55 ml of ethanol and 11 ml of water to which 0.5 g of ammoniumchloride has been added. 5 minutes after completion of the addition, thezinc is removed by filtration of the reaction medium while hot.

The expected product precipitates after the addition of 4.5 ml ofsulphuric acid to the filtrate.

Analysis of the product recrystallized from methanol gives the followingresults:

Analysis for C₉ H₁₅ ClN₂ O₃.5 S₀.5

    ______________________________________                                                  C    H           N      S                                           ______________________________________                                        Calculated  41.78  5.84        10.82                                                                              6.20                                      Found       41.57  5.81        10.95                                                                              6.59                                      ______________________________________                                    

By dilution of the filtrate with 4 ml of concentrated hydrochloric acid,N-(β-methoxyethyl)-2-chloro-paraphenylenediamine hydrochloride isprepared.

PREPARATION EXAMPLE 2 ##STR6## 1) Preparation of4-(β-methoxyethyl)amino-3-methoxynitrobenzene

0.3 mol (56.2 g) of 4-chloro-3-methoxynitrobenzene in 170 ml of2-methoxyethylamine is heated to reflux for 18 hours. The excess2-methoxyethylamine is distilled off. The reaction medium is dilutedwith 300 g of ice-cold water.

The expected product precipitates. After recrystallization from ethanoland then from benzene, it melts at 113° C.

Analysis of the product obtained gives the following results:

Analysis for C₁₀ H₁₄ N₂ O₄

    ______________________________________                                                 C           H      N                                                 ______________________________________                                        Calculated 53.09         6.24   12.38                                         Found      53.36         6.36   12.29                                         ______________________________________                                    

2) Preparation of N-(β-methoxyethyl)-2-methoxy-paraphenylenediaminesulphate

26.5 g of 4-(β-methoxyethyl)amino-3-methoxynitrobenzene are added to asuspension, brought to reflux, of 60 g of powdered zinc in 120 ml ofethanol and 18 ml of water to which 1.2 g of ammonium chloride have beenadded. 5 minutes after completion of the addition, the zinc is removedby filtration. By dilution of the filtrate with 8 ml of sulphuric acid,the expected product precipitates.

After recrystallization from ethanol, the results of the analysis are:

Analysis for C₁₀ H₁₈ N₂ SO₆

    ______________________________________                                                  C    H           N      S                                           ______________________________________                                        Calculated  40.81  6.17        9.52 10.87                                     Found       41.00  6.10        9.38 10.98                                     ______________________________________                                    

I claim:
 1. A process for dyeing keratinous fibers comprising applyingto said fibers in an amount effective to dye said fibers a dyeingcomposition comprising, in an aqueous medium(a) an indole dye present inan amount ranging from 0.1 to 5 percent by weight relative to the totalweight of said composition, and (b) a paraphenylenediaminemonosubstituted on one of the amino groups and having the formula##STR7## wherein R₁₂ represents hydrogen or lower alkyl, R₁₃ representshydrogen, lower alkyl, lower alkoxy or halogen and R₁₄ representshydrogen, lower alkyl, lower alkoxy or halogen and occupies any one ofthe remaining positions of the benzene ring, and the acid addition saltsthereof, said paraphenylenediamine being present in an amount rangingfrom 0.05 to 1 percent by weight relative to the total weight of saidcomposition, and permitting said composition to remain in contact withsaid fibers for a time sufficient to develop in the air a coloration ofsaid fibers without the addition of an oxidizing agent or oxidationcatalyst other than air.
 2. The process of claim 1 which includesperforming several successive applications of said dyeing composition onsaid fibers in an amount and for a time to obtain an increasingly darktinting of said fibers.